<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <!-- 准备一个容器 -->
    <div id="root">
        姓：<input type="text" v-model="firstName"><br/><br/>
        名：<input type="text" v-model="lastName"><br/><br/>
        姓名：<span>{{fullName}}</span>
    </div>
</body>
    <script>
        const vm = new Vue({
            el:'#root',
            data:{
                firstName:"张",
                lastName:"三"
            },
            computed:{
                // 对于只有get方法的计算属性一般这样简写
                fullName() {
                    return this.firstName + '-' + this.lastName
                }
            }
        })
    </script>
</html>